Packaging for v3.2.2 release

[willis102]

• Upgrades packaged six module to 1.13.0
• Adds platform and normalize_platform to sgsix module to provide unified platform value across Python 2/3
• Changes httplib import procedure to emulate direct import of the module
• Adds test to ensure httplib2 is importable as expected

[coveralls]

Pull Request Test Coverage Report for Build 1322

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-2.6%) to 67.139%

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Files with Coverage Reduction	New Missed Lines	%
shotgun_api3/shotgun.py	2	84.01%
shotgun_api3/lib/sgsix.py	3	75.0%
<!--	Total:	5		-->

Totals
Change from base Build 1320:	-2.6%
Covered Lines:	1328
Relevant Lines:	1978

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💛 - Coveralls